人教版九年级物理(初中):磁现象-磁场

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MENTALHEALTHCOUNSELINGPPT第1节磁现象磁场第二十章电与磁人教版九年级物理(初中)PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/公元843年,在天水一色的茫茫大海上,一只帆船正在日夜不停的航行,没有航标,没有明确的航道。他们是怎样摆脱当时的困境的呢?我国很早就利用罗盘(指南针)在航海中指示方向。公元1世纪初,东汉学者王充在《论衡》中记载“司南之杓,投之于地,其柢指南。”即司南在水平光滑的“地盘”上制成的,静止时它的长柄指向南方,为什么?课堂导入PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/演示实验磁铁能吸引哪些物体?用磁铁分别去吸引铁钉、大头针、木块、铝片、硬币、塑料尺、泡沫塑料,然后观察现象。一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/1.磁性:磁铁具有吸引铁、钴、镍的性质。现象:磁铁能吸引、、。硬币大头针铁钉2.磁体:具有磁性的物体。(1)磁体按形状分为:条形磁体针形蹄形磁体一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/(2)磁体按来源分为:天然磁体、人造磁体等。(3)按照磁体保持磁性的长久分为:永磁体、软磁体一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/实验:把铁屑铺在一张白纸上,分别将条形磁体和蹄形磁体平放在铁屑,然后用手轻轻将磁体提起,并轻轻抖动,观察到磁铁两端及中间部分吸引铁屑的多少磁铁的不同部位磁性强弱一样吗?实验方法:转化法;现象:磁体两端吸引铁屑最多,中间最少;结论:磁体各个部分的磁性强弱不同,磁体两端的磁性最强。一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/3.磁极:磁体上磁性最强的部分,在磁体的两端。能够自由转动的小磁针,当它静止时总是一端指南,另一端指北。(1)南极:磁体静止时指南的那一端叫做南极(S极)(2)北极:磁体静止时指北的那一端叫做北极(N极):在水平方向上让磁针自由转动,把小磁针拨动几次,观察每次停下来的指向是否相同?当小磁针自由静止时都指向什么方向?演示实验一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/4.磁极间的相互作用将一根条形磁铁甲用细线悬挂起来,另一根条形磁铁乙的N极分别去靠近甲的N极和S极,再用乙的S极分别去靠近甲的N极和S极,观察现象.观察现象可得到结论:同名磁极相互排斥,异名磁极相互吸引。一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/拿一根铁棒去靠近或接触大头针,会发现铁棒不能吸引大头针,将铁棒在磁铁上按一定的方向摩擦几下,再去靠近大头针。5.磁化原来没磁性的物体在磁体或电流作用下,获得磁性的过程叫做磁化。铁棒再拿铁棒去接触大头针,发现大头针被吸引,铁棒有了磁性。演示实验一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件:om/kejian/huaxue/生物课件:om/kejian/shengwu/地理课件:om/kejian/dili/历史课件:om/kejian/lishi/①手表被磁体磁化后,走时不准;②彩色电视机的显像管被磁化后,色彩失真;(1)磁化的危害(2)磁现象的应用核磁共振录像带电脑的硬盘一、磁现象PPT模板:om/moban/PPT素材:om/sucai/PPT背景:om/beijing/PPT图表:om/tubiao/PPT下载:om/xiazai/PPT教程:om/powerpoint/资料下载:om/ziliao/个人简历:om/jianli/试卷下载:om/shiti/教案下载:om/jiaoan/手抄报:om/shouchaobao/PPT课件:om/kejian/语文课件:om/kejian/yuwen/数学课件:om/kejian/shuxue/英语课件:om/kejian/yingyu/美术课件:om/kejian/meishu/科学课件:om/kejian/kexue/物理课件:om/kejian/wuli/化学课件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